Stop propagation on the Popover Button

[RobinMalfait]

This PR will stop the propagation of click events on the Popover Button that is not inside the Popover Panel. We usually have this behaviour for keyboard events and clicks but probably missed this one.

Fixes: #1260

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headlessui-vue – ./packages/playground-vue

🔍 Inspect: https://vercel.com/tailwindlabs/headlessui-vue/25RjQ8VkwoMJ3KDHECswZmSD6pWC
✅ Preview: https://headlessui-vue-git-stop-popover-button-propagation-tailwindlabs.vercel.app

headlessui-react – ./packages/playground-react

🔍 Inspect: https://vercel.com/tailwindlabs/headlessui-react/9Hy7aBX2L6E5kc9z899swhx7TYpb
✅ Preview: https://headlessui-react-git-stop-popover-button-pr-d0a37e-tailwindlabs.vercel.app

[jasonwhitted-socialive]

This change totally borks us from utilizing events.
A <Popover.Button as="div"> wrapping an element now blocks any event bubbling and we cannot actually react to these events for an item wrapped in a tooltip popover.

This is a clear inversion of control problem. I do not believe that the decision to preventDefault and stopPropagation on an event is the sole responsibility of headlessui to decide.

A user could supply an onClick function that calls preventDefault or stopPropagation if they so choose to. But with this code change the end users no longer have a choice in this.

We were forced to roll back to 1.5.0